दूष्याननुप्रविष्टा वा तीक्ष्णाः शस्त्ररसाभ्यां हन्युः ॥ कZ_०९.५.१५ ॥
dūṣyān anupraviṣṭā vā tīkṣṇāḥ śastrarasābhyāṃ hanyuḥ
或者,已渗透进被抓住把柄者之中的精干密探,应以武器或毒药杀死(目标)。
It represents escalation when conciliation/co-option fails or when the threat is acute; Kautilya presents a graduated toolkit.
Two covert modalities: overt-looking violence (weapon) or deniable killing (poison), chosen for feasibility and concealment.